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FeGtuary 7999 Yoart Mine * 73-02 Drainage and Sediment Contm! Plan ~ 6 <br />Table 13-12.5 <br />YOAST MINE <br />SEDIMENTATION POND DESIGN SUMMARY <br />Pond 012 Pond 013 Pond 014 <br />WATERSHED AREA (acres <br /> <br />Disturbed 275.60 24.24 117.80 <br />Undisturbed 41.90 9.80 36.50 <br />Total Area 319.30 34.04 154.30 <br />POND PARAMETERS: <br /> <br />Bottom Elevation 7,226.0 7,355.0 7,360.0 <br />Princi al S illwa Invert Elevation 7,254.5 7,366.0 7,385.0 <br />Emer enc S illwa Invert Elevation 7,257.0 7,367.5 7,387.5 <br />To of Embankment 7,260.0 7,370.0 7,390.0 <br /> <br />Stora a Volume Below Emer en S illwa ac-ft 20.82 4.62 12.72 <br />Stora a Volume Below Princi al S illwa ao-ft 17.23 3.74 10.47 <br /> <br />Princi al S illwa Parameters: <br />Type Perforated <br />Riser Drop Inlet Drop Inlet <br />Riser Diameter in 30 12 30 <br />Riser Hei ht ft 5 5 5 <br />Barrel Diameter (in) <br />Number of Holes in Riser <br />Size of Holes (in) <br />Elev. Of Holes 24 <br />3 <br />3 <br />7,252.0 12 <br />NA <br />- 24 <br />NA <br /> <br />Emer enc S illwa Parameters: <br />7 e Tra ezoidal Tra ezoidal Tra ezoidal <br />Bottom Width ft 15 10 20 <br />Len th ft 50 30 30 <br />Side Slopes'i H:1V (ft) 3 3 3 <br />HYDROLOGICIHYDRAULIC PARAMETERS: <br /> <br />10-Year, 24-Hour Storm Event: <br />Preci nation in 1.7 1.7 1.7 <br />Runoff Volume ac-ft 17.11 1.98 8.96 <br />Princi al S illwa Peak Dischar a cfs 33.3 4.4 34.0 <br />Emer en S illwa Peak Dischar a ds 0 0 0 <br />Peak Surface Water Sta a Elevation ft 7,256.5 7,367.4 7,387.1 <br /> <br />25-Year, 24-Hour Storm Event: <br />Preci itation in 2.1 2.1 2.1 <br />Runoff Volume ac-ft 24.40 2.79 12.36 <br />Princi al S illwa Peak Dischar a cfs N/A NIA NIA <br />Emer en S illwa Peak Dischar a cfs 117.4 22.8 84.9 <br />Peak Surface Water Sta a Elevation ft 7,259.0 7,368.5 7,388.8 <br />Pond Freeboard (ft) 1.0 1.5 1.2 <br />SEDIMENT LOADING PARAMETERS: <br /> <br />Storm Predicted Peak Sealable Concentration ml/I 0.23 0.00 0.06 <br />Predicted Annual Sediment Loadin ac-ft 13.84 1.49 6.08 <br />Available Sediment Stora a Volume ao-ft 14.09 2.72 6.78 <br />Maximum Sediment Stora a Elevation ft 7,252.0 7,364.0 7,380.0 <br />Predicted Number of Storage Years 1.0 - 1.8 1.1 <br />Montgomery Watson Mixing Gso+r~ * 165 S. Umon Baulevar~l Suite 460 * Lokewoor~ Colorado 80228 * (303J 763-5740 <br /> <br />L J <br />u <br />TR-30 Revised 03/07 <br />